Nodes: Weight drag link search for Math nodes

As @hooglyboogly suggested in D13680, this patch adds weighting
to the search results. Dragging from a vector/rgba socket weights
the Vector Math node higher than a float Math node, and vice versa.

Reviewed By: HooglyBoogly

Differential Revision: https://developer.blender.org/D13691

2 files changed, 12 insertions, 4 deletions

diff --git a/source/blender/nodes/shader/nodes/node_shader_math.cc b/source/blender/nodes/shader/nodes/node_shader_math.cc
index 7337a1172bf..1b450a6414b 100644
--- a/source/blender/nodes/shader/nodes/node_shader_math.cc
+++ b/source/blender/nodes/shader/nodes/node_shader_math.cc
@@ -70,11 +70,15 @@ static void sh_node_math_gather_link_searches(GatherLinkSearchOpParams &params)
   /* Expose first Value socket. */
   if (params.node_tree().typeinfo->validate_link(
           static_cast<eNodeSocketDatatype>(params.other_socket().type), SOCK_FLOAT)) {
+
+    const int weight = ELEM(params.other_socket().type, SOCK_FLOAT, SOCK_BOOLEAN, SOCK_INT) ? 0 :
+                                                                                              -1;
+
     for (const EnumPropertyItem *item = rna_enum_node_math_items; item->identifier != nullptr;
          item++) {
       if (item->name != nullptr && item->identifier != "") {
-        params.add_item(IFACE_(item->name),
-                        SocketSearchOp{"Value", (NodeMathOperation)item->value});
+        params.add_item(
+            IFACE_(item->name), SocketSearchOp{"Value", (NodeMathOperation)item->value}, weight);
       }
     }
   }
diff --git a/source/blender/nodes/shader/nodes/node_shader_vector_math.cc b/source/blender/nodes/shader/nodes/node_shader_vector_math.cc
index 0218e759bea..a488e709373 100644
--- a/source/blender/nodes/shader/nodes/node_shader_vector_math.cc
+++ b/source/blender/nodes/shader/nodes/node_shader_vector_math.cc
@@ -64,6 +64,8 @@ static void sh_node_vector_math_gather_link_searches(GatherLinkSearchOpParams &p
     return;
   }
 
+  const int weight = ELEM(params.other_socket().type, SOCK_VECTOR, SOCK_RGBA) ? 0 : -1;
+
   for (const EnumPropertyItem *item = rna_enum_node_vec_math_items; item->identifier != nullptr;
        item++) {
     if (item->name != nullptr && item->identifier != "") {
@@ -72,11 +74,13 @@ static void sh_node_vector_math_gather_link_searches(GatherLinkSearchOpParams &p
                                                 NODE_VECTOR_MATH_DISTANCE,
                                                 NODE_VECTOR_MATH_DOT_PRODUCT)) {
         params.add_item(IFACE_(item->name),
-                        SocketSearchOp{"Value", (NodeVectorMathOperation)item->value});
+                        SocketSearchOp{"Value", (NodeVectorMathOperation)item->value},
+                        weight);
       }
       else {
         params.add_item(IFACE_(item->name),
-                        SocketSearchOp{"Vector", (NodeVectorMathOperation)item->value});
+                        SocketSearchOp{"Vector", (NodeVectorMathOperation)item->value},
+                        weight);
       }
     }
   }